package com.lzh.financial.util;

import com.lzh.financial.bean.PUserBean;
import com.lzh.financial.dto.UserDTO;
import com.lzh.financial.service.IUserService;
import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import lombok.Data;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpSession;
import java.io.Serializable;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
@Data
@ConfigurationProperties(prefix = "jwt")
@Component
public class JwtTokenUtil implements Serializable {

    private String secret;

    private Long expiration;

    private String header;

    @Autowired
    private IUserService userService;
    /**
     * 从数据声明生成令牌
     *
     * @param claims 数据声明
     * @return 令牌
     */
    private String generateToken(Map<String, Object> claims) {
        Date expirationDate = new Date(System.currentTimeMillis() + expiration*1000);
        return Jwts.builder().setClaims(claims).
                setExpiration(expirationDate).signWith(SignatureAlgorithm.HS512, secret)
                .compact();
    }

    /**
     * 从令牌中获取数据声明
     *
     * @param token 令牌
     * @return 数据声明
     */
    private Claims getClaimsFromToken(String token) {
        Claims claims;
        try {
            claims = Jwts.parser().setSigningKey(secret).parseClaimsJws(token).getBody();
        } catch (Exception e) {
            claims = null;
        }
        return claims;
    }

    /**
     * 生成令牌
     *
     * @param userDetails 用户
     * @return 令牌
     */
    public String generateToken(UserDetails userDetails) {
        Map<String, Object> claims = new HashMap<>(2);
        claims.put("username", userDetails.getUsername());
        claims.put("created", new Date());
        UserDTO userDTO = userService.selectbyUserName(userDetails.getUsername());
        claims.put("userId", userDTO.getUserId());
        return generateToken(claims);
    }

    /**
     * 从令牌中获取用户名
     *
     * @param token 令牌
     * @return 用户名
     */
    public String getUsernameFromToken(String token) {
        String username;
        try {
            Claims claims = getClaimsFromToken(token);
            username = claims.getSubject();
        } catch (Exception e) {
            username = null;
        }
        return username;
    }

    /**
     * 从令牌中获取用户名
     * @return 用户名
     */
    public String getUsernameFromToken(HttpSession session) {
        String token=changeSession(session);
        String username;
        try {
            Claims claims = getClaimsFromToken(token);
            username = claims.get("username").toString();
        } catch (Exception e) {
            username = null;
        }
        return username;
    }

    /**
     * 从令牌中获取用户userId
     *
     * @param token 令牌
     * @return 用户名
     */
    public String getUserIdFromToken(String token) {
        String userId;
        try {
            Claims claims = getClaimsFromToken(token);
            userId = claims.get("userId").toString();
        } catch (Exception e) {
            userId = null;
        }
        return userId;
    }

    /**
     * 从令牌中获取用户userId
     * @return 用户名
     */
    public String getUserIdFromToken(HttpSession session) {
        String token=changeSession(session);
        String userId;
        try {
            Claims claims = getClaimsFromToken(token);
            userId = claims.get("userId").toString();
        } catch (Exception e) {
            userId = null;
        }
        return userId;
    }


    /**
     * 获取token
     * @return 用户名
     */
    private String changeSession(HttpSession session){
        return   (String) session.getAttribute("token");
    }

    /**
     * 判断令牌是否过期
     *
     * @param token 令牌
     * @return 是否过期
     */
    public Boolean isTokenExpired(String token) {
        try {
            Claims claims = getClaimsFromToken(token);
            Date expiration = claims.getExpiration();
            return expiration.before(new Date());
        } catch (Exception e) {
            return false;
        }
    }

    /**
     * 刷新令牌
     *
     * @param token 原令牌
     * @return 新令牌
     */
    public String refreshToken(String token) {
        String refreshedToken;
        try {
            Claims claims = getClaimsFromToken(token);
            claims.put("created", new Date());
            refreshedToken = generateToken(claims);
        } catch (Exception e) {
            refreshedToken = null;
        }
        return refreshedToken;
    }

    /**
     * 验证令牌
     *
     * @param token       令牌
     * @param userDetails 用户
     * @return 是否有效
     */
    public Boolean validateToken(String token, UserDetails userDetails) {
        PUserBean user = (PUserBean) userDetails;
        String username = getUsernameFromToken(token);
        return (username.equals(user.getUserName()) && !isTokenExpired(token));
    }
}
